The heartbeat cycle starts when electric impulses are generated from:
Correct answer: C. SA Node
- A. AV Node
- B. SV Node
- C. SA Node
- D. PQ Node
Explanation
SA Node: This option is the correct answer. The SA (sinoatrial) node, also known as the natural pacemaker of the heart, is the initial site where electric impulses are generated to start the heartbeat cycle. The SA node is located in the right atrium of the heart and sends electrical signals that cause the atria to contract.
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The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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